Media Dream

In my dream, I saw the most interesting media format. It was a tea brown cylinder attached to the ceiling, like a meter-long candle hung upside down. It had a wick with a small flame or light and as it moved from the start of the film at the bottom upward to the end, each frame of the film projected itself onto the wall then disappeared. It could only be viewed once.
In the dream, Mom was watching a memorial film that showed dancers on a stage. I interrupted her with an urgent question and she missed part of the dance. I felt sad and guilty that she had forever lost part of her one viewing.
But what an interesting delivery system. It seems quite impossible, but beautifully steampunk.